.banner{
    height: 500px;
    background-color: #f5f5f5;
}
.banner .wrapper{
    margin: 0 auto;
    width: 1240px;
    height: 500px;
    background-color: pink;
    position: relative;
}
.banner .aside{
    width: 250px;
    height: 500px;
    background-color: rgba(0,0,0,0.8);
    position: absolute;
    left: 0;
    top: 0;
}
.banner .aside li{
    height: 50px;
    line-height: 50px;
}
.banner .aside a{
    display: block;
    height: 50px;
    padding-left: 36px;
    padding-right: 19px;
    color: #fff;
    position: relative;
}
.banner .aside a span{
    font-size: 14px;
    margin-left: 15px;
}
.banner .aside a:hover{
    background-color: #27ba9b;
}
.banner .aside a::after{
    content: "";
    width: 6px;
    height: 11px;
    background-image: url(../images/sprites.png);
    position: absolute;
    right: 19px;
    top: 19px;
    background-position: -80px -110px;
}
